I am British yes. A lot of people don’t realise it, it if you head out of the UK, the international world see’s your average Brit as ugly. We are generally a very ugly people. Sorry that you are just learning this now.
Of course there are exceptions, some absolutely stunning people have come from the UK.
Do you think people are buying skin whiteners and straightening their hair to look….. more British? LOL.
Xenophobia is a trait that's quite natural to me, for people to embrace, but seemingly anathema to your good self. Yet you post prime examples of slurs against natives of a country yourself. Somewhat bizarre hypocrisy at the very least...
Without using wild presumptuousness one would have to ask them themselves why they buy so much skin whitener and hair straightening compounds. Have you considered doing this? My own best guess is it's not to look more British, it's almost certainly more global than that, but I'll leave that you to your own, hopefully unbiased, research.
"Looking" British is far more than being ghostly white, there are such formalities as correctly furled umbrellas, well fitting bowler hats, real leather briefcases, silly(ish) walks, tailor made pin stripe suits, correct usage of cutlery, the correct dress for all occasions, town and country, formal and informal. Being pasty white is just the start
I am not sure where excelling at fighting in a cage comes in, mind you.